[PATCH] drm/amd/display: Fix incorrectly reading prev_dppclk

[Bhawanpreet Lakha]

From: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.corp-partner.google.com>

[Why]
we save the prev_dppclk value using "dpp_inst" but when reading this
value we use the index "i". In a case where a pipe is fused off we can
end up reading the incorrect instance because i != dpp_inst in this
case.

[How]
read the prev_dppclk using dpp_inst instead of i

Signed-off-by: Bhawanpreet Lakha Bhawanpreet.Lakha at amd.com
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
---
 drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
index 02943ca65807..cf1b5f354ae9 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
@@ -122,7 +122,7 @@ static void rn_update_clocks_update_dpp_dto(struct clk_mgr_internal *clk_mgr,
 		dpp_inst = clk_mgr->base.ctx->dc->res_pool->dpps[i]->inst;
 		dppclk_khz = context->res_ctx.pipe_ctx[i].plane_res.bw.dppclk_khz;
 
-		prev_dppclk_khz = clk_mgr->dccg->pipe_dppclk_khz[i];
+		prev_dppclk_khz = clk_mgr->dccg->pipe_dppclk_khz[dpp_inst];
 
 		if (safe_to_lower || prev_dppclk_khz < dppclk_khz)
 			clk_mgr->dccg->funcs->update_dpp_dto(
-- 
2.25.1